Django Geographical Module

Quick start

Add "geographical_module" to your INSTALLED_APPS setting like this:
```
INSTALLED_APPS = [
    ...
    'geographical_module',
]
```
Run python manage.py migrate to create the models.
Run python manage.py load_geo_records to populate the database with the initial records.
Run python manage.py load_nuts_postcode_records to populate the database with the NUTS-postcode relationship.